scuba diver       
noun [ C ] uk/ˈskuː.bə ˌdaɪ.vər/ us/ˈskuː.bə ˌdaɪ.vɚ/
 戴水肺潜水者
someone who swims underwater using special breathing equipment
  Two hundred scuba divers descended on the island to clean up the harbour. 两百名水肺潜水员来到岛上清理海港。 
 See: scuba diving
 - More examples
 - Professional and amateur scuba divers worldwide are being called upon to help monitor the world's oceans and seas.
 - On the same dock, scuba divers were testing their equipment.
 - He has a pilot's license and is a certified scuba diver.
 - Decompression illness affects scuba divers, aviators, and astronauts.
 - Scuba divers with knowledge of archaeology discovered the drowned city 50 years ago.